Precision Twist Drill 5995818 Aircraft Drill Bit 1/8 in

Product Description

The PRECISION TWIST DRILL 5995818 is a cobalt aircraft extension drill bit engineered for drilling through hard metals and high-strength alloys in aerospace and industrial maintenance applications. The bit measures 1/8 inch (0.1250 inch decimal) in diameter with an overall length of 6 inches, making it well suited for reaching into recessed or confined areas that standard-length bits cannot access. The 135-degree split point is self-centering, reducing the need for a center punch and minimizing walking on hard surfaces. A straw finish indicates the cobalt content and helps manage heat during extended cutting operations. Two spiral flutes evacuate chips efficiently, and the tapered web configuration with web thinning reduces thrust force required at the drill press or hand drill.

This bit is designed for use on aluminum, stainless steel, titanium, and other hard or abrasive materials common in aircraft maintenance, fabrication shops, and heavy industrial settings. The 6-inch overall length suits applications where standard jobber-length bits lack the reach, such as drilling through structural members, frame components, or layered sheet stock. The straight cylindrical shank accepts standard drill chucks. General-purpose tool performance and right-hand cutting direction make it compatible with conventional drill presses, magnetic drills, and hand-held power tools used by aviation mechanics, machinists, and maintenance technicians.

Key Features

• Cobalt construction with straw finish for heat resistance in hard-metal drilling
• 135-degree split point is self-centering, reducing drill walk on hard surfaces
• 6-inch overall length provides reach into deep or confined workspaces
• 1-5/8 inch (1.6250 inch decimal) flute length with spiral, two-flute design for efficient chip evacuation
• Web-thinned tapered web reduces drilling thrust and operator fatigue
• Meets NAS 907 Type J standard for aircraft-grade drill bit performance

Compatibility

Designed as an OEM-style aircraft extension drill bit in the CO500-6 series, suitable for use in standard straight-shank drill chucks across drill presses, magnetic base drills, and hand-held power tools requiring a 1/8-inch bit.

Installation Notes

Installation and use of this bit should follow standard machining safety practices. Secure the workpiece firmly before drilling and ensure the chuck is properly tightened onto the straight cylindrical shank. Eye protection and appropriate chip guards are required when drilling hard metals. Allow adequate chip clearing during deep drilling operations to prevent flute packing and bit breakage.